Replies

1. 
   Catskinner | Feb 16, 2004 03:15am | #1

   If we're talking about a synthetic color coat, the key is proper installation. Done right, the synthetics are great, done wrong, they're a nightmare.

   Most importantly, the substrate has to be sound, the exterior details well constructed, and the interior moisture control 100% right.

   Portland cement based color coats are highly permeable. Most synthetics are not very permeable at all. If you have a moisture vapor problem, the synthetics can give you trouble. Otherwise, they are a long-lasting and attractive alternative.

   DRC

1. 
   Petey | Feb 16, 2004 05:01am | #2

   Mr. Crosby. the framing is 2x6 studs with plywood {fir} sheathing. My only concern is that the framers used tyvek, not the stuff theyre marketing for stucco. As far as moisture content, this being new const. would that matter when applied? Thanks for the info. all responses would be appreciated. Petey

1. 
   Catskinner | Feb 16, 2004 06:18pm | #3

   I'd hit the Tyvek website for a phone number and call the manufacturer directly for an opinion on the housewrap. I've never used it under stucco, so I couldn't say. I'm a big fan of two layers of Grade D paper.

   As for moisture, you actually bring up a good point which I had not intended in the original reply.

   By moisture, I am referring to the amount of humidity that will be generated inside your home by cooking, cleaning, showers, heating, breathing. All of this moisture in a well constructed home exits by some means. In a poorly constructed home, the moisture vapor can condense on the inside face of exterior walls and the inside of roofs.

   When moisture vapor condenses on the inside face of exterior walls that have synthetic stucco, the results are not desirable. The repair cost can be astronomical, and the contractors liability insurance may not cover it (mine doesn't).

   Generally, this should not be a big consideration in new construction performed by a competent builder. We're supposed to know better.

   The point I think you bring up -- the dryness of the framing lumber -- is actually a good one. Stucco is only as good as the substrate. If the lumber warps, the stucco cracks. Take a look at the grade stamp on the framing lumber. If it says S-DRY or KD, and it doesn't rain a real lot where you are right now, you probably don't have anything to worry about. I'd only be concerned if the lumber was stamped S-GRN.

   Properly applied, stucco is one of the most durable sidings there is. Improperly applied, it's trouble. Before you start, you could check the reputation of the stucco sub, and certainly talk with your builder about your concerns directly. Any good builder appreciates an informed client.

   Please let us know how it goes.

   DRC